18019320 has 192 divisors, whose sum is σ = 63776160. Its totient is φ = 4055040.

The previous prime is 18019307. The next prime is 18019321. The reversal of 18019320 is 2391081.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 246804 + ... + 246876.

Almost surely, 2^18019320 is an apocalyptic number.

18019320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18019320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31888080).

18019320 is an abundant number, since it is smaller than the sum of its proper divisors (45756840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18019320 is a wasteful number, since it uses less digits than its factorization.

18019320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 18019320 is about 4244.9169603185. The cubic root of 18019320 is about 262.1678701973.

The spelling of 18019320 in words is "eighteen million, nineteen thousand, three hundred twenty".